Diemeer, Mart

Driessen, A.

Hilderink, L.T.H.

Yang, J.

English

The infrared fluorescence (890nm, 1060nm, 1330 nm) of a $Nd{(TTA)}_3Phen$ (TTA= thenoyltrifluoroacetone, Phen = 1, 10-phenanthroline) doped 6-FDA epoxy (6-fluorinated-dianhydride cured epoxy) film was observed by pumping with a Ti:Sapphire laser at 800nm. Furthermore, $Nd{(TTA)}_3Phen$-doped 6FDA epoxy channel waveguides were fabricated and their loss spectrum was measured

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Experimental study of Nd(TTA)3Phen-doped  6-FDA/Epoxy Waveguides J. Yang, M.B.J. Diemeer, L.T.H. Hilderink, and A. Driessen University of Twente, Integrated Optical Microsystems Group, P.O. Box 217, Enschede, the Netherlands The infrared fluorescence (890nm, 1060nm, 1330nm) of a Nd(TTA)3Phen (TTA = thenoyltrifluoroacetone, Phen = 1, 10-phenanthroline) doped 6-FDA epoxy (6-fluorinated-dianhydride cured epoxy ) film was observed by pumping with a Ti:Sapphire laser at 800nm. Furthermore, Nd(TTA)3Phen doped 6-FDA epoxy channel waveguides were fabricated and their loss spectrum was measured. Introduction Lasing and amplification by rare-earth doped polymer materials has been widely investigated [1-2]. In our previous work [3], a Nd(TTA)3phen doped 6-FDA epoxy film was spin-coated on an thermally oxidized wafer. The Judd-Ofelt analysis based on the absorption spectrum shows that this neodymium doped polymer material has a good potential to be used as a planar waveguide in lasers or amplifiers.  In this paper, the spontaneous emission spectrum of this neodymium doped film and the fabrication of Nd(TTA)3phen doped 6-FDA epoxy channel waveguides by backfilling the core material in inverted cladding channels are presented. Spontaneous emission spectrum of neodymium doped film The absorption spectrum of Nd(TTA)3phen doped 6-FDA epoxy film, which is obtained in our previous work [3], indicates the absorption peaks at 580nm, 740nm, 800nm and 865nm.  Therefore, the recording of the room temperature fluorescence spectrum was performed using the 800 nm line of a tunable Ti:Sapphire laser as the excitation source. The spontaneous emission spectrum was recorded by an optical spectrum analyzer (Spectro 320, Instrument System) and is shown in Fig. 1 Three distinct emission bands with peaks at 890 nm, 1060nm and 1330nm can be seen clearly. They correspond to transitions from the 4F3/2 level to the 4I9/2, 4I11/2, and 4I13/2 levels.  900 1000 1100 1200 1300 14000.00000.00020.00040.00060.00080.0010Intensity (a.u.)Wavelength (nm)                             Fig. 1 Room temperature spontaneous emission of the Nd(TTA)3phen doped           6-FDA epoxy film pumped by Ti:Sapphire laser at 800nm. Proceedings Workshop IEEE/LEOS Benelux Chapter, 2007, Eindhoven7Waveguide fabrication and loss measurement By spin-coating and photodefining a cycloaliphatic epoxy prepolymer (code name CHEP) [4], inverted channels in the low index CHEP polymer were obtained on a thermally oxidized wafer. The core material, a Nd(TTA)3phen doped 6-FDA epoxy solution, was then backfilled via spin-coating twice and the Nd doped channel waveguide was realized after thermal curing. A lower refractive index silicon containing epoxy was used as the upper cladding, and on the top of which a Pyrex glass wafer was applied. Fig. 2 shows a microscope picture of the waveguide cross section (~40 μm).  The waveguide loss was determined from the optical output of samples with different lengths using butt-coupled 50 μm multimode fibers, a broadband white light source at the input and the Spectro 320 at the output. The loss spectrum clearly shows the absorption lines of the neodymium, which appear at 580, 740, 800 and 865 nm (Fig. 3).            550 600 650 700 750 800 850 900024681012Loss spectrum (dB/cm)Wavelength (nm)  Fig. 2 Microscope picture of the Nd doped             Fig. 3 Loss spectrum of the Nd(TTA)3phen doped channel waveguide cross-section.                                   6-FDA epoxy channel waveguide. Conclusion Spontaneous emission spectrum of the neodymium doped polymer film with three peaks at 890nm, 1060nm and 1330nm was obtained. Channel waveguides were realized by backfilling the inverted channels in a low index epoxy with the core material and their loss was measured. This study demonstrates that Nd(TTA)3Phen doped 6-FDA epoxy is well suited for lasing or amplification in optical waveguides. Acknowledgement The authors acknowledge the financial support of STW (TOE 6986). References [1] S. Lin, R. J. Feuerstein, and A.R. Mickelson, "A study of neodymium-chelate-doped optical polymer waveguides", J. Appl. Phys., vol. 79, pp.2868-2874, 1996.  [2] K. Kueki and Y. Koike, “Plastic optical fiber lasers and amplifiers containing lanthanide complex”, Chem. Rev., vol 102, pp. 2347-2356, 2002. [3] J. Yang, M.B.J. Diemeer, L.T.H. Hilderink, R. Dekker, and A. Driessen, “Judd-Ofelt analysis of Nd(TTA)3phen doped 6-FDA/epoxy planar waveguides,” in Proceedings of the Annual Symposium of the IEEE/LEOS Benelux Chapter 2006, pp. 253-256. [4] M.B.J. Diemeer, L.T.H. Hilderink, H. Kelderman, and A. Driessen, “Multimode waveguides of Photodefinable epoxy for optical backplane applications,” in Proceedings of the Annual Symposium of the IEEE/LEOS Benelux Chapter 2006, pp. 53-56. Experimental study of Nd(TTA)3Phen-doped 6-FDA/Epoxy Waveguides8

Experimental study of Nd(TTA)<sub>3</sub>Phen-doped 6-FDA/epoxy waveguides

https://ris.utwente.nl/ws/files/5394703/Yang_LEOSBNLWorkshop2007.pdf

Experimental study of Nd(TTA)<sub>3</sub>Phen-doped 6-FDA/epoxy waveguides

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